31310224221 has 4 divisors (see below), whose sum is σ = 41746965632. Its totient is φ = 20873482812.

The previous prime is 31310224219. The next prime is 31310224237. The reversal of 31310224221 is 12242201313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31310224221 - 2¹ = 31310224219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31310224261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5218370701 + ... + 5218370706.

It is an arithmetic number, because the mean of its divisors is an integer number (10436741408).

Almost surely, 2^31310224221 is an apocalyptic number.

It is an amenable number.

31310224221 is a deficient number, since it is larger than the sum of its proper divisors (10436741411).

31310224221 is a wasteful number, since it uses less digits than its factorization.

31310224221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10436741410.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31310224221 its reverse (12242201313), we get a palindrome (43552425534).

The spelling of 31310224221 in words is "thirty-one billion, three hundred ten million, two hundred twenty-four thousand, two hundred twenty-one".